Interrupt storm on acpi0 occurred after madt.c change

Peter Schultz pmes at
Sat Jan 31 11:25:05 PST 2004

John Baldwin wrote:
> On Friday 30 January 2004 11:40 am, Sangwoo Shim wrote:
>>I've experienced interrupt storm on acpi0 after your v1.10 madt.c commit.
>>(which is located at src/sys/i386/acpica/madt.c);
>>What really makes me frustrating is this storm wasn't here before 1.10
>>change, which is exactly stand against your commit log message. :-(
>>I've recompiled kernel with v1.9 of madt.c and the problem didn't occur.
>>I'm using ASUS P2B-D with two p3-650 processors.
>>BIOS version is 1014 beta 3 (which is the last published one);
>>My kernel config is stripped GENERIC, which includes
>>option	CPU_FASTER_5X86_FPU
>>device	acpi		# Mine hangs with acpi loaded as module.
>>Attached file is my acpidump -t -d output.
> Can you provide a dmesg?  IRQ20 on your box is a PCI interrupt and PCI 
> interrupts are level/lo, not level/hi.  To top it off, ACPI states that the 
> SCI is supposed to always be level/lo.  You must have a very broken BIOS to 
> get a storm now.
I have this problem as well, here's my verbose dmesg and ASL:

I've not reverted to v1.9 of madt.c, but I'm sure it would make all the 
difference it did for the others.


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